Question

oxidation no of sulphur in caro's acid is

Answer 1

Oxidation number of sulphur in  Caro's - Peroxymonosulfuric acid (H₂SO₅ )

2 + x - 10

x= +8

x= oxidation number of Sulphur

But this cannot be true as maximum oxidation number for S cannot exceed + 6. Since S has only 6 electrons in its valence shell.

This exceptional value of oxidattion state for sulphur in H₂SO₅  is due to the peroxy linkage shown by two atoms.

so, Oxidation number of S in H₂SO₅

2 (+1) + x + 3 (-2) + 2 (-1) [for peroxy linkage] = 0

2 + x -6 -2 = 0

x = + 6

so, Oxidation number of S in H₂SO₅ is +6.